Stay-bolt structure.



suv yBou STRUCTURE." APPucATl'oN maarre. 29. |916.

Putcntgd Oft. 17,191.6.v

,nivrrnn str BENJAMIN E. D. A's'.iArroni) AND ETHAN I. norms, or PITTSBURGH, PENNSYLVANIA; AssiGNoiis 'ro FLANNnnY Bom: COMPANY, or rifrrssimeii, PENNSYLVANIA.'

vs'rAY-isoifi srmicrimn. l I m l I I 1,201,887, Specification. f Letters lateut Patented'et. 1 7, 1916.'

' Application aia February 29, i916. vserial No. 81,259.

T o'eZZ whom t may concern: enlarged portion forming a' base 13 seated4 Beit known that' we, 'BENJAMIN D. against the outer boiler sheet 2 and .weldedf S'iAri'roRD and ETHAN I. DoDDs, citizens ofthereto as indicatedat 14. the United States, andV residents of Pitts- Our improvements provide .Simple means burgh,'in the county of Allegheny'and Statev which will aflordvsuch a yielding connecof Pennsylvania, have'invented certain. new tion for the stay bolt tothe boiler sheet as 60 and useful Improvements in i Stay Bolt will permit universal movement of the outer Structures; and we do hereby declare the end of the bolt and allow the same' to so following to be a full, clear, andexact dyield longitudinally as to insurefree movescription of the invention, such as will enment ofthe inner sheet and relieve the bolt able' others skilled Iin the art to which it.I of the greater portion of strain or fatigue 65 appeitains to malte and use the same. such as usually borne by .rigid stayV bolts.

This invention relates-to improvements in -At Certain' times, as l'when the boiler is, Stay-bolt structures, an object ol the inveii- Cold, there will be a gap or clearance space tion being to provide simple and eiiicient lbeUWeeIl the Curved falle 1l 0f the gland means for c onnectinga rigid stay bolt with and the curved -se'at it in theouter boiler 70 an outer boiler sheet in such manner that it plate. lvhen.' the boiler is under pressure, L

will' be permitted to yield in allvdirections' the gap or clearancel space l'will be closed;

without subjecting either of the boiler sheets with the curved face 11 of the glandfin con- .20 tol undue strain, to accommodate movement 'ClCt l Wlth the' ClHVed Set. 1r-bringing the of said sheets (especially 'the inner sheet) bolt vunder tension between the boiler sheets. 75

- 'diie -to expansionA and contraction. The gland will thus be relieved of anyhigli `With this and other` objects in view, the pleSSureS- invention consists in certain novel tea-tures. Our improvements serve not only to afford ct construction and combinations of parts a flexible and universal coupling means for as ,liereinafter'- set forth and pointed out in the 1301i? OlSh bOle'l. Sheet, but they 21150 80 the Claims; prevent leakage. The chamber 17 formed in y The .accompanying drawing -s t View' 'the gland maycontain stiff grease or other artly in section 'and partly in elevation f lubricant which serve to protect the device 3() illustrating our i'nvention. against collection of incrustation.

- 1 representsan inner boiler sheet and 2 Hering fully describedour invention what 85 the outer sheet,-l.the' latter being provided we claim as new and desire to secure'by Letwith a bolt hole -3, a portion of the wall of ters-Patent, is

which is curved' to form a seat Ll. A stay' l. In 'a stay bolt structure, a ,yielding bolt 5 is secured to the inner sheet 1 andV member comprising a central threaded part' passesy through the hole 3 in .the outer to receive tliegoiitei threaded end of a stay 90 sheet,-tlie projecting portionof said bolt bolt, said yielding member also havinga being screw threaded as shown at 6; The base member to lie flat against the outer bolt is made' with a tell-tale. hole 7 in its face of the outer boiler sheet and adapted.

4o outer portion and this hole is open 'at the to be secured to the same.

' y upset end 8 oit the bolt. 2. In a stay bolt structure,- a yielding 95 A gland or yielding member 9 is made member'comprising a central threaded part with an internally threaded portion 10 to to ieceive the outer threaded portion-of a receive the threaded outer portion of the stay bolt and 'also having'a bowed ange stay bolt, 'and the said portion 10 of the provided witha base portionadapted to be gland projects into the hole in the boiler welded to the outer face'ofan outer boiler 100 sheet 2 and is formed near its inner end sheet. with acurved face 11 disposed parallel with 3. In a stay bolt structure, the co'mbna and adapted, under normal working condition with an outer boiler sheet having a bolt tions of the boiler, to Yengage the curved holeV Joriiiinga seat, and a stay bolt having Seat in said boiler sheet. The gland .9 also a threaded o utei end portion, ot a \'icldi ng 105 comprises a v'bowed Harige 12 which lends member having a tlireadeil central portion flexibility to the whole structure, and this' to receive the threaded pertain ot the bolt. y bowed flange is made at its free edge with said central nortioii also having-a curved face near its` .inner `end disposed -ubstanspecification in the presence of-two subscribv tally parallel with the curved seat in the ing Witnesses.

boiler sheet, and said 'yielding member also BENJAMIN E. D. 'STAFFORD.' formed Witlra bowed portion llaving a base l ETI-IAN- DODDS.

5 portion lying flat against the outer face-of Witnesses:

the outer boiler sheet and Welded thereto. A FJH; ALLISON,

In testimony Wl1ereof,wel1avesigned this f EDWIN Sgj-R'YCE. 

